LIVY-323. Fixed livy-repl doesn't start with a lot of spark packages. (#312)

Some Spark packages are depending on scala-reflect 2.11.0 and it conflicts with Spark's scala version 2.11.8.
This's not Livy's fault actually but doesn't hurt to make Livy more fault tolerant.
Since the scala-reflect jar with the correct version must already be in CLASSPATH, fixed livy-repl to not load user supplied scala-reflect jars.

repl/scala-2.10/src/main/scala/com/cloudera/livy/repl/SparkInterpreter.scala

@@ -92,6 +92,10 @@ class SparkInterpreter(conf: SparkConf,
             .filter { u => u.getProtocol == "file" && new File(u.getPath).isFile }
             // Livy rsc and repl are also in the extra jars list. Filter them out.
             .filterNot { u => Paths.get(u.toURI).getFileName.toString.startsWith("livy-") }
+            // Some bad spark packages depend on the wrong version of scala-reflect. Blacklist it.
+            .filterNot { u =>
+              Paths.get(u.toURI).getFileName.toString.contains("org.scala-lang_scala-reflect")
+            }
 
           extraJarPath.foreach { p => debug(s"Adding $p to Scala interpreter's class path...") }
           sparkIMain.addUrlsToClassPath(extraJarPath: _*)

repl/scala-2.11/src/main/scala/com/cloudera/livy/repl/SparkInterpreter.scala

@@ -78,6 +78,10 @@ class SparkInterpreter(conf: SparkConf,
             .filter { u => u.getProtocol == "file" && new File(u.getPath).isFile }
             // Livy rsc and repl are also in the extra jars list. Filter them out.
             .filterNot { u => Paths.get(u.toURI).getFileName.toString.startsWith("livy-") }
+            // Some bad spark packages depend on the wrong version of scala-reflect. Blacklist it.
+            .filterNot { u =>
+              Paths.get(u.toURI).getFileName.toString.contains("org.scala-lang_scala-reflect")
+            }
 
           extraJarPath.foreach { p => debug(s"Adding $p to Scala interpreter's class path...") }
           sparkILoop.addUrlsToClassPath(extraJarPath: _*)